Presses



ditched glatte are can.

Letters Patent No. 111,776, dated February 14, `1871.

'IMPROVEMENT IN ADJUSTABLE ATTACHMENTS OF CAMS FOR FLIERS `OF PRINTING-PRESSES.

The Schedule referred to in these Letters Patent and making of the sama.

To all whom, it may concern.-

Be it known that I, CHARLES POTTER, Jr., ofPlainfield, n1 the county ot'Union, in the State of -N ew Jersey, have invented a new and usefulImprovement in Printing-Presses; and Ldo hereby declare that thefollowing is a full and exact description thereof. My invention relatesto il'nprovements for operating the fly which removes the sheets. It hasbeen come mon to operate these by a cam or wild-cat which lifts the flyevery time during a portion of its' revolution by a wedge-likeoperation, and allows it to fly downward again by the action of aspring. It is necessary that the period of this release andfly movementshallbe changeable with each change in the size of the sheets. Itis alsodesirable that the cam or wild-cat7 which I will hereafter term simplythe cam, shall be readily removable when under some circumstances it isdesirable to opera-te the cam withoutthe fly, and shall induce noseriousevils when a press, through any mismanagement or carelessness, is turnedbackward.

My invention fulfills all these conditions very successf'ully.,

I will proceed to describe what I consider the best means for carryingont my invention.

The accompanying drawing forms a part of this specification.

Figure I isa side view of the cam, with the novel Afastening andadjusting means. v

Figure II is a section on the line-S Soi' Fig. I.

Figure III represents the modification of the forms of the parts which Iconsider equivalent.

Similar letters of reference indicate corresponding parts in all thefigures.

A is a shaft, and B is the cani which is to be adjustahly held thereon.lhe shaft A is contracted a little where it receives the cam, and itterminates a little within the hub of the cani.

A' is a terminal piece fitting on or close Vto the emh of the shaft, andcompelled 'to turn therewith by means of pins a a, which are fixed inthe piece A, 'and project into holes in the shaft A, as represented.

- C is a thumb-screw, which confines the terminal piece A to the shaftA, andholdsit nearly in contact' v with the end of the shaft, or allowsit to move away therefrom within considerable limits, according as thescrew C is adjusted.

Directing attention now to the modification shown in Fig. II, it will beseen that the cam rests against the perpendicular shoulder on one side,andy is pressed.

against that shoulder bythe force of the screw C applied through themedium of the-piece A', which latter is conical and tits into acorresponding conical seat on the adjacent end of the hub of the cam.

Directing attention now to Fig. III, it will be observed that theconstruction is similar except that the shoulder on the shaft A isconical, and that the corresponding or adjacent surface of the cam iscorref spondingly excavated, while the piece A ts ainst the other end ofthe hub, with a shoulder which is perpendicular to the axis.V Eitherform may be used with success.

IVith either form, by slacking the screw C, and thus releasing theterminal piece A', the latter moves ax' tracts its diameter, at or nearthe point of entering the A cam, bythe letter m, and. I will designatethe surface on the opposite end of' the cam, which may also be termedthe end of the hub of the cam, by n.

The cam is held against turning around entirely by the friction ortraction at these points. The traction on the surface m'conveys theforce directly from the shaft A to the cam. The traction on the surfacem con veys thc`force bet weeu these parts indirectlythro ugh the mediumof the terminal piece A. But as the latter is compelled to turn with theshaft through'the medium of the strong pins c a, the effect is the samewhether the principal part of the force is derived through the surfaceon or the surface n. A,

'Ihe tract-ive force is increased with a given amount of end pressure bymaking the surface conical. In the form shown in FigfII more thanhalfthe force is transmitted throughthe piece A'. In the other form,Fig. Ill, more than half is transmitted directly. I

can make either of the surfaces conical at pleasure.

I caninake both conical with good'effect, in which case the terminalpiece A and its adjacent surfaces will be as shown in fig. II, while thesnrfacem' will be also conical, as shown in fig. III. It may be alsopracticable to construct the work successfully with both of theshoulders perpendicular, but I have not tried this,'and I do not proposeto. 1 esteem the conical surfaces very greatly preferable.

lhe ordinary mode of fixing the cam upon the shaft is by inserting aset-screw or pinching-screw through the hub and bearing against theshaft diametrically.'

There are several evils incident to this arrangement which my inventioneompletely'avolds. The shaft is liable to become indented by the pointof' the screw, and such indentations interfere greatly with anysubsequent nice adjustment. f The cam with such arrangement canbeadjusted at points widely differing from its former position, or itmay be adjusted exactly in its former position, but it l cannot beadjusted near it without liability of the end of the screw slipping intothe dent and bringing the cam toits old position.

Another serious evil with the old arrangement is the injury t'o thesurfaces, when in consequence of a turning of the machine backward theearn is hooked against the fly-rod, and is forcibly held so' thatitcannot be turned while the shaft continues to revolve.

This causes an abrasion of the snrface of the shaft I find, with theconical surfaces, thatl 'a moderate pressure of the screw C issufficient .to hold the cam. Y The cones must not be made too tapering.I esteem it important that the cani shall be able to slipin case of anyextraordinary strain.

A special advantage due to my invention which has not yet been referredto, is the nearly complete cern tainty that the screw Ojwill slaeken oflitself when the printing-press is turned backward so as 'to hookorarrest the cam. Y

The friction of the piece A', under the' wide collar" of the vscrew U,is su'eient to turn it backward under such circumstances and set the camfree. All' that is necessary in such case then is to readj ust the cam,and the press is ready to work as before, without anypart having beenstrained.

I claim as my invention- The within-described improvement in thetlymech` anism 1n printing-presses, consist-ing of the terminal pieceA', and the locking means a, arranged to serve relatively tothe shaft A,the'axially-adjusting,r -mean's O, and ily-cam B, substantially as andfor thel purposes herein set forth.

In testimony whereof I have hereunto in presence of two snbseribingwitnesses.

C. POTTER, JR,

set myun'ame Witnesses THOMAS D. Swanson.

U. C. LIvINGS.

